Our Swift observations were acquired with the on-board instruments
X-Ray Telescope (hereafter XRT, [1]}) and
UltraViolet-Optical Telescope (hereafter UVOT,
[2]}). The XRT allows covering the X–ray band
between 0.3 and 10 keV band, whereas UVOT data were collected using the UV
filter \(UVM2\)  (reference wavelength: 2246 Å; see
[3]} and [4]} for
details). On-source pointings were simultaneously performed with the two
instruments and lasted between \(\sim \) 800 and \(\sim \) 2000 s.
